Add parameters to Up and Down Days in a Row strategy documentation

strategies/up-and-down-days-in-a-row/README.md

@@ -16,4 +16,10 @@ As with most of the strategies from this book, they are meant to illustrate cert
 1. Enter a long trade when the market (e.g., SPX or SPY) closes lower for 3 consecutive days.
 2. Exit the trade after one week.
 
+## Parameters
+
+**Days in a Row**: The number of consecutive days where the close must be higher / lower in order to enter a long trade. (Default: 3)
+
+**Days to Exit**: The number of days to hold any trades before exiting. (Default: 5)
+
 ---